ARTPOP is the most exciting era because there is no specific "look" set in stone. In the fame Era it was basically all the time like in the 2008 pic but now we can just expect Gaga to be herself and where what ever because she now is the Queen of Pop so she doesn't need to stick to just one theme in her clothes. You know what I mean?
I don't know about you but I think that even if she wears almost the same wig, makeup and outfit, she still looks very different... Maybe it's the attitude or something, idk.
She keeps reincarnating her previous looks which is awesome to us. We won't forget any memorable era even we are dealing with the new era. Bow down, to Queen Gaga.
For the people saying that she had a nose job or something, I don't think she did. Just pay attention at the size if the glasses. The ones on the left are bigger than the ones on the right. Therefore making Gaga's nose seem a bit smaller. :)